//
//  UITableView+MMAdd.m
//  oc_demo
//
//  Created by haigui on 2021/8/5.
//

#import "UITableView+MMAdd.h"

@implementation UITableView (MMAdd)

/// 圆角化section 该方法需要写在willDisplayCell代理中
/// @param cell willDisplayCell
/// @param indexPath willDisplay indexPath
/// @param cornerRadius 圆角
/// @param edgeDistance 距离屏幕边缘的距离
/// @param addShadow 是否添加显示阴影
- (void)roundCornersSectionForCell:(UITableViewCell *)cell forIndexPath:(NSIndexPath *)indexPath cornerRadius:(CGFloat)cornerRadius edgeDistance:(CGFloat)edgeDistance addShadow:(BOOL)addShadow{
    
    // 设置cell 背景色为透明
    cell.backgroundColor = UIColor.clearColor;
    // 创建两个layer
    CAShapeLayer *normalLayer = [[CAShapeLayer alloc] init];
    CAShapeLayer *selectLayer = [[CAShapeLayer alloc] init];
    // 获取显示区域大小
    CGRect bounds = CGRectInset(cell.bounds, edgeDistance, 0);
    // cell的backgroundView
    UIView *normalBgView = [[UIView alloc] initWithFrame:bounds];
    // 获取每组行数
    NSInteger rowNum = [self numberOfRowsInSection:indexPath.section];
    // 贝塞尔曲线
    UIBezierPath *bezierPath = nil;
    
    if (rowNum == 1) {
        // 一组只有一行（四个角全部为圆角）
        bezierPath = [UIBezierPath bezierPathWithRoundedRect:bounds byRoundingCorners:UIRectCornerAllCorners cornerRadii:CGSizeMake(cornerRadius, cornerRadius)];
        normalBgView.clipsToBounds = NO;
    }else {
        normalBgView.clipsToBounds = YES;
        if (indexPath.row == 0) {
            normalBgView.frame = UIEdgeInsetsInsetRect(bounds, UIEdgeInsetsMake(addShadow?-5:0, 0, 0, 0));
            CGRect rect = UIEdgeInsetsInsetRect(bounds, UIEdgeInsetsMake(addShadow?5:0, 0, 0, 0));
            // 每组第一行（添加左上和右上的圆角）
            bezierPath = [UIBezierPath bezierPathWithRoundedRect:rect byRoundingCorners:UIRectCornerTopLeft|UIRectCornerTopRight cornerRadii:CGSizeMake(cornerRadius, cornerRadius)];
        }else if (indexPath.row == rowNum - 1) {
            normalBgView.frame = UIEdgeInsetsInsetRect(bounds, UIEdgeInsetsMake(0, 0, addShadow?-5:0, 0));
            CGRect rect = UIEdgeInsetsInsetRect(bounds, UIEdgeInsetsMake(0, 0, addShadow?5:0, 0));
            // 每组最后一行（添加左下和右下的圆角）
            bezierPath = [UIBezierPath bezierPathWithRoundedRect:rect byRoundingCorners:UIRectCornerBottomLeft|UIRectCornerBottomRight cornerRadii:CGSizeMake(cornerRadius, cornerRadius)];
        }else {
            // 每组不是首位的行不设置圆角
            bezierPath = [UIBezierPath bezierPathWithRect:bounds];
        }
    }

    // 阴影
    if (addShadow) {
        normalLayer.shadowColor = [UIColor colorWithHexString:@"#F63030"].CGColor;
        normalLayer.shadowOpacity = 0.2;
        normalLayer.shadowOffset = CGSizeMake(0, 2);
//        normalLayer.path = bezierPath.CGPath;
        normalLayer.shadowPath = bezierPath.CGPath;
    }

    // 把已经绘制好的贝塞尔曲线路径赋值给图层，然后图层根据path进行图像渲染render
    normalLayer.path = bezierPath.CGPath;
    selectLayer.path = bezierPath.CGPath;

    // 设置填充颜色
    normalLayer.fillColor = [UIColor whiteColor].CGColor;
    // 添加图层到nomarBgView中
    [normalBgView.layer insertSublayer:normalLayer atIndex:0];
    normalBgView.backgroundColor = UIColor.clearColor;
    cell.backgroundView = normalBgView;

    // 替换cell点击效果
    UIView *selectBgView = [[UIView alloc] initWithFrame:bounds];
    selectLayer.fillColor = [UIColor colorWithWhite:0.95 alpha:1.0].CGColor;
    [selectBgView.layer insertSublayer:selectLayer atIndex:0];
    selectBgView.backgroundColor = UIColor.clearColor;
    cell.selectedBackgroundView = selectBgView;
 /*
    // 设置cell的背景色为透明，如果不设置这个的话，则原来的背景色不会被覆盖
    cell.backgroundColor = UIColor.clearColor;

    // 创建一个shapeLayer
    CAShapeLayer *normalLayer = [[CAShapeLayer alloc] init];
    CAShapeLayer *selectLayer = [[CAShapeLayer alloc] init]; //显示选中
    // 创建一个可变的图像Path句柄，该路径用于保存绘图信息
    CGMutablePathRef pathRef = CGPathCreateMutable();
    // 获取cell的size
    // 第一个参数,是整个 cell 的 bounds, 第二个参数是距左右两端的距离,第三个参数是距上下两端的距离
    CGRect bounds = CGRectInset(cell.bounds, 0, 0);
    
    // CGRectGetMinY：返回对象顶点坐标
    // CGRectGetMaxY：返回对象底点坐标
    // CGRectGetMinX：返回对象左边缘坐标
    // CGRectGetMaxX：返回对象右边缘坐标
    // CGRectGetMidX: 返回对象中心点的X坐标
    // CGRectGetMidY: 返回对象中心点的Y坐标

    // 这里要判断分组列表中的第一行，每组section的第一行，每组section的中间行

    // CGPathAddRoundedRect(pathRef, nil, bounds, cornerRadius, cornerRadius);
    if ([self numberOfRowsInSection:indexPath.section] == 1) {
        CGPathMoveToPoint(pathRef, nil, CGRectGetMinX(bounds), CGRectGetMaxY(bounds));
        CGPathAddArcToPoint(pathRef, nil, CGRectGetMinX(bounds), CGRectGetMinY(bounds), CGRectGetMidX(bounds), CGRectGetMinY(bounds), cornerRadius);
        CGPathAddArcToPoint(pathRef, nil, CGRectGetMaxX(bounds), CGRectGetMinY(bounds), CGRectGetMaxX(bounds), CGRectGetMidY(bounds), cornerRadius);
        CGPathAddArcToPoint(pathRef, nil, CGRectGetMaxX(bounds), CGRectGetMaxY(bounds), CGRectGetMidX(bounds), CGRectGetMaxY(bounds), cornerRadius);
        CGPathAddArcToPoint(pathRef, nil, CGRectGetMinX(bounds), CGRectGetMaxY(bounds), CGRectGetMinX(bounds), CGRectGetMidY(bounds), cornerRadius);
        CGPathAddLineToPoint(pathRef, nil, CGRectGetMinX(bounds), CGRectGetMaxY(bounds));
    }else{
        if (indexPath.row == 0) {
            // 初始起点为cell的左下角坐标
            CGPathMoveToPoint(pathRef, nil, CGRectGetMinX(bounds), CGRectGetMaxY(bounds));
            // 起始坐标为左下角，设为p，（CGRectGetMinX(bounds), CGRectGetMinY(bounds)）为左上角的点，设为p1(x1,y1)，(CGRectGetMidX(bounds), CGRectGetMinY(bounds))为顶部中点的点，设为p2(x2,y2)。然后连接p1和p2为一条直线l1，连接初始点p到p1成一条直线l，则在两条直线相交处绘制弧度为r的圆角。
            CGPathAddArcToPoint(pathRef, nil, CGRectGetMinX(bounds), CGRectGetMinY(bounds), CGRectGetMidX(bounds), CGRectGetMinY(bounds), cornerRadius);
            CGPathAddArcToPoint(pathRef, nil, CGRectGetMaxX(bounds), CGRectGetMinY(bounds), CGRectGetMaxX(bounds), CGRectGetMidY(bounds), cornerRadius);
            // 终点坐标为右下角坐标点，把绘图信息都放到路径中去,根据这些路径就构成了一块区域了
            CGPathAddLineToPoint(pathRef, nil, CGRectGetMaxX(bounds), CGRectGetMaxY(bounds));
        } else if (indexPath.row == [self numberOfRowsInSection:indexPath.section]-1) {
            // 初始起点为cell的左上角坐标
            CGPathMoveToPoint(pathRef, nil, CGRectGetMinX(bounds), CGRectGetMinY(bounds));
            CGPathAddArcToPoint(pathRef, nil, CGRectGetMinX(bounds), CGRectGetMaxY(bounds), CGRectGetMidX(bounds), CGRectGetMaxY(bounds), cornerRadius);
            CGPathAddArcToPoint(pathRef, nil, CGRectGetMaxX(bounds), CGRectGetMaxY(bounds), CGRectGetMaxX(bounds), CGRectGetMidY(bounds), cornerRadius);
            // 添加一条直线，终点坐标为右下角坐标点并放到路径中去
            CGPathAddLineToPoint(pathRef, nil, CGRectGetMaxX(bounds), CGRectGetMinY(bounds));
        } else {
            // 添加cell的rectangle信息到path中（不包括圆角）
            CGPathAddRect(pathRef, nil, bounds);
        }
    }
    // 把已经绘制好的可变图像路径赋值给图层，然后图层根据这图像path进行图像渲染render
    normalLayer.path = pathRef;
    selectLayer.path = pathRef;
    // 注意：但凡通过Quartz2D中带有creat/copy/retain方法创建出来的值都必须要释放
    CFRelease(pathRef);
    // 按照shape layer的path填充颜色，类似于渲染render
    // normalLayer.fillColor = [UIColor colorWithWhite:1.f alpha:0.8f].CGColor;
    normalLayer.fillColor = [UIColor whiteColor].CGColor;
    
    // view大小与cell一致
    UIView *roundView = [[UIView alloc] initWithFrame:bounds];
    // 添加自定义圆角后的图层到roundView中
    [roundView.layer insertSublayer:normalLayer atIndex:0];
    roundView.backgroundColor = UIColor.clearColor;
    
    // cell的背景view
    cell.backgroundView = roundView;

    // 以上方法存在缺陷当点击cell时还是出现cell方形效果，因此还需要添加以下方法
    // 如果你 cell 已经取消选中状态的话,那以下方法是不需要的.
    UIView *selectedBackgroundView = [[UIView alloc] initWithFrame:bounds];
    selectLayer.fillColor = [UIColor colorWithWhite:0.95 alpha:1.0].CGColor;
    [selectedBackgroundView.layer insertSublayer:selectLayer atIndex:0];
    selectedBackgroundView.backgroundColor = UIColor.clearColor;
    cell.selectedBackgroundView = selectedBackgroundView;
  */
}
- (void)roundCornersSectionForCell:(UITableViewCell *)cell forIndexPath:(NSIndexPath *)indexPath cornerRadius:(CGFloat)cornerRadius{
    [self roundCornersSectionForCell:cell forIndexPath:indexPath cornerRadius:cornerRadius edgeDistance:0 addShadow:NO];
}
/// 取消plan样式下 section的粘性 该方法需要写在scrollViewDidScroll代理中
/// @param sectionHeaderHeight section设置的高度
- (void)cancelSectionViscous:(CGFloat)sectionHeaderHeight{
    if (self.style != UITableViewStylePlain) {
        return;
    }
    if (self.contentOffset.y <= sectionHeaderHeight && self.contentOffset.y >= 0)
    {
        self.contentInset = UIEdgeInsetsMake(-self.contentOffset.y, 0, 0, 0);
    }
     else if (self.contentOffset.y >= sectionHeaderHeight)
    {
        self.contentInset = UIEdgeInsetsMake(-sectionHeaderHeight, 0, 0, 0);
    }
}


@end
